Air Force awards contract for air to surface missile Published Sept. 25, 2023 Photo Details / Download Hi-Res EGLIN AIR FORCE BASE, Fla. - The Air Force awarded a firm, fixed price contract to Northrop Grumman Defense Systems Sept. 8 to begin work on the Stand-in Attack Weapon. The contract value is approximately $705 million. The SiAW is an advanced air-to-surface missile providing stand-in platforms the ability to rapidly strike a wide variety of targets. The SiAW effort focuses on Open, Agile, and Digital tenets to help outpace the threat, and will utilize Digital Engineering and Weapon Open System Architecture to incorporate mature technologies and leverage existing weapon designs. The work will be performed in Northridge, California and to be completed by end of Fiscal year 2026. The Armament Directorate of the Air Force Life Cycle Management Center provides the contracting activity and program management of these prototyping efforts.